Any ore that contains economically usable iron is called iron ore. There are many types of iron ore, and magnetite (Fe3O4), hematite (Fe2O3) and siderite (FeCO3) are mainly used for iron making. After the iron ore sample is dissolved in hydrochloric acid, the iron therein is converted into Fe3. Under strong acidic conditions, Fe3 can be reduced to Fe2 by SnCl2. After Sn2 is reduced by Fe3, methyl orange can also be reduced by the reduction of Sn2 to hydrogenated methyl orange, so methyl orange can indicate the end point of Fe3 reduction. Sn2 can also continue to reduce the hydrogenated methyl orange to N,N-dimethyl-p-phenylenediamine and sodium p-aminobenzenesulfonate. Iron ore is an international commodity, strategic material, and belongs to the economic lifeline.
The world's iron ore resources are concentrated in Australia, Brazil, Russia, Ukraine, Kazakhstan, India, the United States, Canada, South Africa and other countries. As the world's largest iron ore demand country, China's own iron ore reserves are not small, but the taste is unfortunately low. From the perspective of industrial economy, it is better to be rich in iron ore from Australia, Brazil and other countries. import.
The iron ore that can be directly put into steelmaking steelmaking is called “flat furnace rich mineâ€. The iron ore that can be directly used for ironmaking is called “boiler rich mineâ€, and both have a “rich†character. These rich ore are preferably magnetite and hematite, and their iron content is above 70%.
Poor ore, or iron ore with more harmful impurities, needs to be mineralized first, and the cost will go up at once. The classification of iron ore is very complicated. It can be divided into many aspects according to the main components, harmful impurities, structural forms, gangue types, etc. Each angle can be divided into many kinds. Which one is used in industry, which corresponds to what kind of The process flow, there is a lot of attention, is a great study. The Beijing University of Science and Technology in our country, formerly known as the Beijing Iron and Steel Institute, is studying how to make iron and steel.
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